
/*
 * Most of this source has been derived from the Linux USB
 * project:
 *   (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
 *   (c) 2000 David L. Brown, Jr. (usb-storage@davidb.org)
 *   (c) 1999 Michael Gee (michael@linuxspecific.com)
 *   (c) 2000 Yggdrasil Computing, Inc.
 *
 *
 * Adapted for U-Boot:
 *   (C) Copyright 2001 Denis Peter, MPL AG Switzerland
 *
 * For BBB support (C) Copyright 2003
 * Gary Jennejohn, DENX Software Engineering <gj@denx.de>
 *
 * BBB support based on /sys/dev/usb/umass.c from
 * FreeBSD.
 *
 * See file CREDITS for list of people who contributed to this
 * project.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of
 * the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 * MA 02111-1307 USA
 *
 */
/* Note:
 * Currently only the CBI transport protocoll has been implemented, and it
 * is only tested with a TEAC USB Floppy. Other Massstorages with CBI or CB
 * transport protocoll may work as well.
 */
/*
 * New Note:
 * Support for USB Mass Storage Devices (BBB) has been added. It has
 * only been tested with USB memory sticks.
 * Nota bene: if you are using the BBB support with a little-endian
 * CPU then you MUST define LITTLEENDIAN in the configuration file!
 */
//#include <common.h>
//#include <command.h>
//#include <asm/processor.h>
#include "usb.h"
#include "s3c2410.h"
#include "scsi.h"

//#undef USB_STOR_DEBUG
#undef BBB_COMDAT_TRACE
#undef BBB_XPORT_TRACE
#define  USB_STOR_DEBUG
//#define  BBB_COMDAT_TRACE
//#define  BBB_XPORT_TRACE

#ifdef	USB_STOR_DEBUG
//#define USB_STOR_PRINTF(fmt,args...)	 s_UartPrint (fmt ,##args)
#define USB_STOR_PRINTF	 s_UartPrint
#else
#define USB_STOR_PRINTF
#endif
/* direction table -- this indicates the direction of the data
 * transfer for each command code -- a 1 indicates input
 */
unsigned char us_direction[256/8] = 
{
    0x28, 0x81, 0x14, 0x14, 0x20, 0x01, 0x90, 0x77,
    0x0C, 0x20, 0x00, 0x04, 0x00, 0x00, 0x00, 0x00,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x01,
    0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};


#define US_DIRECTION(x) ((us_direction[x>>3] >> (x & 7)) & 1)
static unsigned char usb_stor_buf[512];
static ccb usb_ccb;
/*
 * CBI style
 */
#define US_CBI_ADSC		0
/*
 * BULK only
 */
#define US_BBB_RESET		       0xff
#define US_BBB_GET_MAX_LUN	0xfe
/* Command Block Wrapper */
typedef struct 
{
    U32		dCBWSignature;
    #define CBWSIGNATURE	0x43425355
    U32		dCBWTag;
    U32		dCBWDataTransferLength;
    U8		bCBWFlags;
    #define CBWFLAGS_OUT	0x00
    #define CBWFLAGS_IN	0x80
    U8		bCBWLUN;
    U8		bCDBLength;
    #define CBWCDBLENGTH	16
    U8		CBWCDB[CBWCDBLENGTH];
} 
umass_bbb_cbw_t;
#define UMASS_BBB_CBW_SIZE	31
static U32 CBWTag = 0;
/* Command Status Wrapper */
typedef struct 
{
    U32		dCSWSignature;
    #define CSWSIGNATURE	0x53425355
    U32		dCSWTag;
    U32		dCSWDataResidue;
    U8		bCSWStatus;
    #define CSWSTATUS_GOOD	0x0
    #define CSWSTATUS_FAILED 0x1
    #define CSWSTATUS_PHASE	0x2
} 
umass_bbb_csw_t;
#define UMASS_BBB_CSW_SIZE	13
#define USB_MAX_STOR_DEV 5
static int usb_max_devs = 0; /* number of highest available usb device */
static block_dev_desc_t usb_dev_desc[USB_MAX_STOR_DEV];
struct us_data;
typedef int (*trans_cmnd)(ccb*, struct us_data*);
typedef int (*trans_reset)(struct us_data*);
struct us_data 
{
    struct usb_device	*pusb_dev;	 /* this usb_device */
    unsigned int		flags;		 /* from filter initially */
    unsigned char		ifnum;		 /* interface number */
    unsigned char		ep_in;		 /* in endpoint */
    unsigned char		ep_out;		 /* out ....... */
    unsigned char		ep_int;		 /* interrupt . */
    unsigned char		subclass;	 /* as in overview */
    unsigned char		protocol;	 /* .............. */
    unsigned char		attention_done;	 /* force attn on first cmd */
    unsigned short	ip_data;	 /* interrupt data */
    int				action;		 /* what to do */
    int				ip_wanted; /* needed */
    int				*irq_handle;	 /* for USB int requests */
    unsigned int		irqpipe;	 /* pipe for release_irq */
    unsigned char		irqmaxp;	/* max packed for irq Pipe */
    unsigned char	        irqinterval; /* Intervall for IRQ Pipe */
    ccb				*srb;		 /* current srb */
    trans_reset		transport_reset; /* reset routine */
    trans_cmnd		transport; /* transport routine */
};


static struct us_data usb_stor[USB_MAX_STOR_DEV];
#define USB_STOR_TRANSPORT_GOOD	   0
#define USB_STOR_TRANSPORT_FAILED -1
#define USB_STOR_TRANSPORT_ERROR  -2
int usb_stor_get_info(struct usb_device *dev, struct us_data *us, block_dev_desc_t *dev_desc);
int usb_storage_probe(struct usb_device *dev, unsigned int ifnum,struct us_data *ss);
unsigned long usb_stor_read(int device, unsigned long blknr, unsigned long blkcnt, unsigned long *buffer);
struct usb_device * usb_get_dev_index(int index);
block_dev_desc_t *usb_stor_get_dev(int index)
{
    return &usb_dev_desc[index];
}


void usb_show_progress(void)
{
    USB_STOR_PRINTF(".");
}


/*********************************************************************************
 * show info on storage devices; 'usb start/init' must be invoked earlier
 * as we only retrieve structures populated during devices initialization
 */
void usb_stor_info(void)
{
    int i;
    if (usb_max_devs > 0)
    for (i = 0; i < usb_max_devs; i++) 
    {
        USB_STOR_PRINTF("Device %d: ", i);
        dev_print(&usb_dev_desc[i]);
    }
    else
    USB_STOR_PRINTF("No storage devices, perhaps not 'usb start'ed..?\n");
}


/*********************************************************************************
 * scan the usb and reports device info
 * to the user if mode = 1
 * returns current device or -1 if no
 */
int usb_stor_scan(int mode)
{
    unsigned char i;
    struct usb_device *dev;
    /* GJ */
	
    memset(usb_stor_buf, 0, sizeof(usb_stor_buf));
    if(mode==1) 
    {
        USB_STOR_PRINTF("scanning bus for storage devices... ");
    }
    usb_disable_asynch(1); /* asynch transfer not allowed */
    for(i=0;i<USB_MAX_STOR_DEV;i++) 
    {
        memset(&usb_dev_desc[i],0,sizeof(block_dev_desc_t));
        usb_dev_desc[i].target=0xff;
        usb_dev_desc[i].if_type=IF_TYPE_USB;
        usb_dev_desc[i].dev=i;
        usb_dev_desc[i].part_type=PART_TYPE_UNKNOWN;
        usb_dev_desc[i].block_read=usb_stor_read;
    }
    usb_max_devs=0;
    for(i=0;i<USB_MAX_DEVICE;i++) 
    {
        dev=usb_get_dev_index(i); /* get device */
        USB_STOR_PRINTF("i=%d\n",i);
        if(dev==NULL) 
        {
            break; /* no more devices avaiable */
        }
        if(usb_storage_probe(dev,0,&usb_stor[usb_max_devs])) 
        {
            /* ok, it is a storage devices */
            /* get info and fill it in */
            if(usb_stor_get_info(dev, &usb_stor[usb_max_devs], &usb_dev_desc[usb_max_devs]))
            usb_max_devs++;
        } 
        /* if storage device */
        if(usb_max_devs==USB_MAX_STOR_DEV) 
        {
            USB_STOR_PRINTF("max USB Storage Device reached: %d stopping\n",usb_max_devs);
            break;
        }
    } 
    /* for */
    usb_disable_asynch(0); /* asynch transfer allowed */
    USB_STOR_PRINTF("%d Storage Device(s) found\n", usb_max_devs);
    if(usb_max_devs>0)
    return 0;
    else
    return-1;
}


static int usb_stor_irq(struct usb_device *dev)
{
    struct us_data *us;
    us=(struct us_data *)dev->privptr;
    if(us->ip_wanted) 
    {
        us->ip_wanted=0;
    }
    return 0;
}


static void usb_show_srb(ccb * pccb)
{
    int i;
    USB_STOR_PRINTF("SRB: len %d datalen 0x%lX\n ",pccb->cmdlen,pccb->datalen);
    for(i=0;i<12;i++) 
    {
        USB_STOR_PRINTF("%02X ",pccb->cmd[i]);
    }
    USB_STOR_PRINTF("\n");
}


static void display_int_status(unsigned long tmp)
{
    USB_STOR_PRINTF("Status: %s %s %s %s %s %s %s\n",
    (tmp & USB_ST_ACTIVE) ? "Active" : "",
    (tmp & USB_ST_STALLED) ? "Stalled" : "",
    (tmp & USB_ST_BUF_ERR) ? "Buffer Error" : "",
    (tmp & USB_ST_BABBLE_DET) ? "Babble Det" : "",
    (tmp & USB_ST_NAK_REC) ? "NAKed" : "",
    (tmp & USB_ST_CRC_ERR) ? "CRC Error" : "",
    (tmp & USB_ST_BIT_ERR) ? "Bitstuff Error" : "");
}


/***********************************************************************
 * Data transfer routines
 ***********************************************************************/
static int us_one_transfer(struct us_data *us, int pipe, char *buf, int length)
{
    int max_size;
    int this_xfer;
    int result;
    int partial;
    int maxtry;
    int stat;
    /* determine the maximum packet size for these transfers */
    max_size = usb_maxpacket(us->pusb_dev, pipe) * 16;
    /* while we have data left to transfer */
    while (length) 
    {
        /* calculate how long this will be -- maximum or a remainder */
        this_xfer = length > max_size ? max_size : length;
        length -= this_xfer;
        /* setup the retry counter */
        maxtry = 10;
        /* set up the transfer loop */
        do 
        {
            /* transfer the data */
            USB_STOR_PRINTF("Bulk xfer 0x%x(%d) try #%d\n",
            (unsigned int)buf, this_xfer, 11 - maxtry);
            result = usb_bulk_msg(us->pusb_dev, pipe, buf,
            this_xfer, &partial, USB_CNTL_TIMEOUT*5);
            USB_STOR_PRINTF("bulk_msg returned %d xferred %d/%d\n",
            result, partial, this_xfer);
            if(us->pusb_dev->status!=0) 
            {
                /* if we stall, we need to clear it before we go on */
                display_int_status(us->pusb_dev->status);
                if (us->pusb_dev->status & USB_ST_STALLED) 
                {
                    USB_STOR_PRINTF("stalled ->clearing endpoint halt for pipe 0x%x\n", pipe);
                    stat = us->pusb_dev->status;
                    usb_clear_halt(us->pusb_dev, pipe);
                    us->pusb_dev->status=stat;
                    if(this_xfer == partial) 
                    {
                        USB_STOR_PRINTF("bulk transferred with error %X, but data ok\n",us->pusb_dev->status);
                        return 0;
                    }
                    else
                    return result;
                }
                if (us->pusb_dev->status & USB_ST_NAK_REC) 
                {
                    USB_STOR_PRINTF("Device NAKed bulk_msg\n");
                    return result;
                }
                if(this_xfer == partial) 
                {
                    USB_STOR_PRINTF("bulk transferred with error %d, but data ok\n",us->pusb_dev->status);
                    return 0;
                }
                /* if our try counter reaches 0, bail out */
                USB_STOR_PRINTF("bulk transferred with error %d, data %d\n",us->pusb_dev->status,partial);
                if (!maxtry--)
                return result;
            }
            /* update to show what data was transferred */
            this_xfer -= partial;
            buf += partial;
            /* continue until this transfer is done */
        } 
        while ( this_xfer );
    }
    /* if we get here, we're done and successful */
    return 0;
}


static int usb_stor_BBB_reset(struct us_data *us)
{
    int result;
    unsigned int pipe;
    /*
    	 * Reset recovery (5.3.4 in Universal Serial Bus Mass Storage Class)
    	 *
    	 * For Reset Recovery the host shall issue in the following order:
    	 * a) a Bulk-Only Mass Storage Reset
    	 * b) a Clear Feature HALT to the Bulk-In endpoint
    	 * c) a Clear Feature HALT to the Bulk-Out endpoint
    	 *
    	 * This is done in 3 steps.
    	 *
    	 * If the reset doesn't succeed, the device should be port reset.
    	 *
    	 * This comment stolen from FreeBSD's /sys/dev/usb/umass.c.
    	 */
    USB_STOR_PRINTF("BBB_reset\n");
    result = usb_control_msg(us->pusb_dev, usb_sndctrlpipe(us->pusb_dev,0),
    US_BBB_RESET, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
    0, us->ifnum, 0, 0, USB_CNTL_TIMEOUT*5);
    if((result < 0) && (us->pusb_dev->status & USB_ST_STALLED))
    {
        USB_STOR_PRINTF("RESET:stall\n");
        return -1;
    }
    /* long wait for reset */
    wait_ms(150);
    USB_STOR_PRINTF("BBB_reset result %d: status %X reset\n",result,us->pusb_dev->status);
    pipe = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
    result = usb_clear_halt(us->pusb_dev, pipe);
    /* long wait for reset */
    wait_ms(150);
    USB_STOR_PRINTF("BBB_reset result %d: status %X clearing IN endpoint\n",result,us->pusb_dev->status);
    /* long wait for reset */
    pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);
    result = usb_clear_halt(us->pusb_dev, pipe);
    wait_ms(150);
    USB_STOR_PRINTF("BBB_reset result %d: status %X clearing OUT endpoint\n",result,us->pusb_dev->status);
    USB_STOR_PRINTF("BBB_reset done\n");
    return 0;
}


/* FIXME: this reset function doesn't really reset the port, and it
 * should. Actually it should probably do what it's doing here, and
 * reset the port physically
 */
static int usb_stor_CB_reset(struct us_data *us)
{
    unsigned char cmd[12];
    int result;
    USB_STOR_PRINTF("CB_reset\n");
    memset(cmd, 0xFF, sizeof(cmd));
    cmd[0] = SCSI_SEND_DIAG;
    cmd[1] = 4;
    result = usb_control_msg(us->pusb_dev, usb_sndctrlpipe(us->pusb_dev,0),
    US_CBI_ADSC, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
    0, us->ifnum, cmd, sizeof(cmd), USB_CNTL_TIMEOUT*5);
    /* long wait for reset */
    wait_ms(1500);
    USB_STOR_PRINTF("CB_reset result %d: status %X clearing endpoint halt\n",result,us->pusb_dev->status);
    usb_clear_halt(us->pusb_dev, usb_rcvbulkpipe(us->pusb_dev, us->ep_in));
    usb_clear_halt(us->pusb_dev, usb_rcvbulkpipe(us->pusb_dev, us->ep_out));
    USB_STOR_PRINTF("CB_reset done\n");
    return 0;
}


/*
 * Set up the command for a BBB device. Note that the actual SCSI
 * command is copied into cbw.CBWCDB.
 */
int usb_stor_BBB_comdat(ccb *srb, struct us_data *us)
{
    int result;
    int actlen;
    int dir_in;
    unsigned int pipe;
    umass_bbb_cbw_t cbw;
    dir_in = US_DIRECTION(srb->cmd[0]);
    #ifdef BBB_COMDAT_TRACE
    USB_STOR_PRINTF("dir %d lun %d cmdlen %d cmd %p datalen %d pdata %p\n", dir_in, srb->lun, srb->cmdlen, srb->cmd, srb->datalen, srb->pdata);
    if (srb->cmdlen) 
    {
        for(result = 0;result < srb->cmdlen;result++)
        USB_STOR_PRINTF("cmd[%d] %#x ", result, srb->cmd[result]);
        USB_STOR_PRINTF("\n");
    }
    #endif
    /* sanity checks */
    if (!(srb->cmdlen <= CBWCDBLENGTH)) 
    {
        USB_STOR_PRINTF("usb_stor_BBB_comdat:cmdlen too large\n");
        return -1;
    }
    /* always OUT to the ep */
    pipe = usb_sndbulkpipe(us->pusb_dev, us->ep_out);
    cbw.dCBWSignature = swap_32(CBWSIGNATURE);
    cbw.dCBWTag = swap_32(CBWTag++);
    cbw.dCBWDataTransferLength = swap_32(srb->datalen);
    cbw.bCBWFlags = (dir_in? CBWFLAGS_IN : CBWFLAGS_OUT);
    cbw.bCBWLUN = srb->lun;
    cbw.bCDBLength = srb->cmdlen;
    /* copy the command data into the CBW command data buffer */
    /* DST SRC LEN!!! */
    memcpy(cbw.CBWCDB, srb->cmd, srb->cmdlen);
    result = usb_bulk_msg(us->pusb_dev, pipe, &cbw, UMASS_BBB_CBW_SIZE, &actlen, USB_CNTL_TIMEOUT*5);
    if (result < 0)
    USB_STOR_PRINTF("usb_stor_BBB_comdat:usb_bulk_msg error\n");
    return result;
}


/* FIXME: we also need a CBI_command which sets up the completion
 * interrupt, and waits for it
 */
int usb_stor_CB_comdat(ccb *srb, struct us_data *us)
{
    int result = 0;
    int dir_in,retry;
    unsigned int pipe;
    unsigned long status;
    retry=5;
    dir_in=US_DIRECTION(srb->cmd[0]);
    if(dir_in)
    pipe=usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
    else
    pipe=usb_sndbulkpipe(us->pusb_dev, us->ep_out);
    while(retry--) 
    {
        USB_STOR_PRINTF("CBI gets a command: Try %d\n",5-retry);
        usb_show_srb(srb);
        /* let's send the command via the control pipe */
        result = usb_control_msg(us->pusb_dev, usb_sndctrlpipe(us->pusb_dev,0),
        US_CBI_ADSC, USB_TYPE_CLASS | USB_RECIP_INTERFACE,
        0, us->ifnum,
        srb->cmd, srb->cmdlen, USB_CNTL_TIMEOUT*5);
        USB_STOR_PRINTF("CB_transport: control msg returned %d, status %X\n",result,us->pusb_dev->status);
        /* check the return code for the command */
        if (result < 0) 
        {
            if(us->pusb_dev->status & USB_ST_STALLED) 
            {
                status=us->pusb_dev->status;
                USB_STOR_PRINTF(" stall during command found, clear pipe\n");
                usb_clear_halt(us->pusb_dev,  usb_sndctrlpipe(us->pusb_dev,0));
                us->pusb_dev->status=status;
            }
            USB_STOR_PRINTF(" error during command %02X Stat = %X\n",srb->cmd[0],us->pusb_dev->status);
            return result;
        }
        /* transfer the data payload for this command, if one exists*/
        USB_STOR_PRINTF("CB_transport: control msg returned %d, direction is %s to go 0x%lx\n",result,dir_in ? "IN" : "OUT",srb->datalen);
        if (srb->datalen) 
        {
            result = us_one_transfer(us, pipe, (char *)srb->pdata,srb->datalen);
            USB_STOR_PRINTF("CBI attempted to transfer data, result is %d status %lX, len %d\n", result,us->pusb_dev->status,us->pusb_dev->act_len);
            if(!(us->pusb_dev->status & USB_ST_NAK_REC))
            break;
        } 
        /* if (srb->datalen) */
        else
        break;
    }
    /* return result */
    return result;
}


int usb_stor_CBI_get_status (ccb * srb, struct us_data *us)
{
    int timeout;
    us->ip_wanted = 1;
    submit_int_msg (us->pusb_dev, us->irqpipe,
    (void *) &us->ip_data, us->irqmaxp, us->irqinterval);
    timeout = 1000;
    while (timeout--) 
    {
        if ((volatile int *) us->ip_wanted == 0)
        break;
        wait_ms (10);
    }
    if (us->ip_wanted) 
    {
        USB_STOR_PRINTF("	Did not get interrupt on CBI\n");
        us->ip_wanted = 0;
        return USB_STOR_TRANSPORT_ERROR;
    }
    USB_STOR_PRINTF
    ("Got interrupt data 0x%x, transfered %d status 0x%lX\n",
    us->ip_data, us->pusb_dev->irq_act_len,
    us->pusb_dev->irq_status);
    /* UFI gives us ASC and ASCQ, like a request sense */
    if (us->subclass == US_SC_UFI) 
    {
        if (srb->cmd[0] == SCSI_REQ_SENSE ||
        srb->cmd[0] == SCSI_INQUIRY)
        return USB_STOR_TRANSPORT_GOOD; /* Good */
        else if (us->ip_data)
        return USB_STOR_TRANSPORT_FAILED;
        else
        return USB_STOR_TRANSPORT_GOOD;
    }
    /* otherwise, we interpret the data normally */
    switch (us->ip_data) 
    {
    case 0x0001:
        return USB_STOR_TRANSPORT_GOOD;
    case 0x0002:
        return USB_STOR_TRANSPORT_FAILED;
    default:
        return USB_STOR_TRANSPORT_ERROR;
    }
    /* switch */
    return USB_STOR_TRANSPORT_ERROR;
}


#define USB_TRANSPORT_UNKNOWN_RETRY 5
#define USB_TRANSPORT_NOT_READY_RETRY 10
/* clear a stall on an endpoint - special for BBB devices */
int usb_stor_BBB_clear_endpt_stall(struct us_data *us, U8 endpt)
{
    int result;
    /* ENDPOINT_HALT = 0, so set value to 0 */
    result = usb_control_msg(us->pusb_dev, usb_sndctrlpipe(us->pusb_dev,0),
    USB_REQ_CLEAR_FEATURE, USB_RECIP_ENDPOINT,
    0, endpt, 0, 0, USB_CNTL_TIMEOUT*5);
    return result;
}


int usb_stor_BBB_transport(ccb *srb, struct us_data *us)
{
    int result, retry;
    int dir_in;
    int actlen, data_actlen;
    unsigned int pipe, pipein, pipeout;
    umass_bbb_csw_t csw;
    #ifdef BBB_XPORT_TRACE
    unsigned char *ptr;
    int index;
    #endif
    dir_in = US_DIRECTION(srb->cmd[0]);
    /* COMMAND phase */
    USB_STOR_PRINTF("COMMAND phase\n");
    result = usb_stor_BBB_comdat(srb, us);
    if (result < 0) 
    {
        USB_STOR_PRINTF("failed to send CBW status %ld\n",
        us->pusb_dev->status);
        usb_stor_BBB_reset(us);
        return USB_STOR_TRANSPORT_FAILED;
    }
    wait_ms(5);
    pipein = usb_rcvbulkpipe(us->pusb_dev, us->ep_in);
    pipeout = usb_sndbulkpipe(us->pusb_dev, us->ep_out);
    /* DATA phase + error handling */
    data_actlen = 0;
    /* no data, go immediately to the STATUS phase */
    if (srb->datalen == 0)
    goto st;
    USB_STOR_PRINTF("DATA phase\n");
    if (dir_in)
    pipe = pipein;
    else
    pipe = pipeout;
    result = usb_bulk_msg(us->pusb_dev, pipe, srb->pdata, srb->datalen, &data_actlen, USB_CNTL_TIMEOUT*5);
    /* special handling of STALL in DATA phase */
    if((result < 0) && (us->pusb_dev->status & USB_ST_STALLED)) 
    {
        USB_STOR_PRINTF("DATA:stall\n");
        /* clear the STALL on the endpoint */
        result = usb_stor_BBB_clear_endpt_stall(us, dir_in? us->ep_in : us->ep_out);
        if (result >= 0)
        /* continue on to STATUS phase */
        goto st;
    }
    if (result < 0) 
    {
        USB_STOR_PRINTF("usb_bulk_msg error status %ld\n",
        us->pusb_dev->status);
        usb_stor_BBB_reset(us);
        return USB_STOR_TRANSPORT_FAILED;
    }
    #ifdef BBB_XPORT_TRACE
    for (index = 0; index < data_actlen; index++)
    USB_STOR_PRINTF("pdata[%d] %#x ", index, srb->pdata[index]);
    USB_STOR_PRINTF("\n");
    #endif
    /* STATUS phase + error handling */
st:
    retry = 0;
again:
    USB_STOR_PRINTF("STATUS phase\n");
    result = usb_bulk_msg(us->pusb_dev, pipein, &csw, UMASS_BBB_CSW_SIZE,
    &actlen, USB_CNTL_TIMEOUT*5);
    /* special handling of STALL in STATUS phase */
    if((result < 0) && (retry < 1) && (us->pusb_dev->status & USB_ST_STALLED)) 
    {
        USB_STOR_PRINTF("STATUS:stall\n");
        /* clear the STALL on the endpoint */
        result = usb_stor_BBB_clear_endpt_stall(us, us->ep_in);
        if (result >= 0 && (retry++ < 1))
        /* do a retry */
        goto again;
    }
    if (result < 0) 
    {
        USB_STOR_PRINTF("usb_bulk_msg error status %ld\n",
        us->pusb_dev->status);
        usb_stor_BBB_reset(us);
        return USB_STOR_TRANSPORT_FAILED;
    }
    #ifdef BBB_XPORT_TRACE
    ptr = (unsigned char *)&csw;
    for (index = 0; index < UMASS_BBB_CSW_SIZE; index++)
    USB_STOR_PRINTF("ptr[%d] %#x ", index, ptr[index]);
    USB_STOR_PRINTF("\n");
    #endif
    /* misuse pipe to get the residue */
    pipe = swap_32(csw.dCSWDataResidue);
    if (pipe == 0 && srb->datalen != 0 && srb->datalen - data_actlen != 0)
    pipe = srb->datalen - data_actlen;
    if (CSWSIGNATURE != swap_32(csw.dCSWSignature)) 
    {
        USB_STOR_PRINTF("!CSWSIGNATURE\n");
        usb_stor_BBB_reset(us);
        return USB_STOR_TRANSPORT_FAILED;
    } 
    else if ((CBWTag - 1) != swap_32(csw.dCSWTag)) 
    {
        USB_STOR_PRINTF("!Tag\n");
        usb_stor_BBB_reset(us);
        return USB_STOR_TRANSPORT_FAILED;
    } 
    else if (csw.bCSWStatus > CSWSTATUS_PHASE) 
    {
        USB_STOR_PRINTF(">PHASE\n");
        usb_stor_BBB_reset(us);
        return USB_STOR_TRANSPORT_FAILED;
    } 
    else if (csw.bCSWStatus == CSWSTATUS_PHASE) 
    {
        USB_STOR_PRINTF("=PHASE\n");
        usb_stor_BBB_reset(us);
        return USB_STOR_TRANSPORT_FAILED;
    } 
    else if (data_actlen > srb->datalen) 
    {
        USB_STOR_PRINTF("transferred %dB instead of %dB\n",
        data_actlen, srb->datalen);
        return USB_STOR_TRANSPORT_FAILED;
    } 
    else if (csw.bCSWStatus == CSWSTATUS_FAILED) 
    {
        USB_STOR_PRINTF("FAILED\n");
        return USB_STOR_TRANSPORT_FAILED;
    }
    return result;
}


int usb_stor_CB_transport(ccb *srb, struct us_data *us)
{
    int result,status;
    ccb *psrb;
    ccb reqsrb;
    int retry,notready;
    psrb=&reqsrb;
    status=USB_STOR_TRANSPORT_GOOD;
    retry=0;
    notready=0;
    /* issue the command */
do_retry:
    result=usb_stor_CB_comdat(srb,us);
    USB_STOR_PRINTF("command / Data returned %d, status %X\n",result,us->pusb_dev->status);
    /* if this is an CBI Protocol, get IRQ */
    if(us->protocol==US_PR_CBI) 
    {
        status=usb_stor_CBI_get_status(srb,us);
        /* if the status is error, report it */
        if(status==USB_STOR_TRANSPORT_ERROR) 
        {
            USB_STOR_PRINTF(" USB CBI Command Error\n");
            return status;
        }
        srb->sense_buf[12]=(unsigned char)(us->ip_data>>8);
        srb->sense_buf[13]=(unsigned char)(us->ip_data&0xff);
        if(!us->ip_data) 
        {
            /* if the status is good, report it */
            if(status==USB_STOR_TRANSPORT_GOOD) 
            {
                USB_STOR_PRINTF(" USB CBI Command Good\n");
                return status;
            }
        }
    }
    /* do we have to issue an auto request? */
    /* HERE we have to check the result */
    if((result<0) && !(us->pusb_dev->status & USB_ST_STALLED)) 
    {
        USB_STOR_PRINTF("ERROR %X\n",us->pusb_dev->status);
        us->transport_reset(us);
        return USB_STOR_TRANSPORT_ERROR;
    }
    if((us->protocol==US_PR_CBI) &&
    ((srb->cmd[0]==SCSI_REQ_SENSE) ||
    (srb->cmd[0]==SCSI_INQUIRY))) 
    {
        /* do not issue an autorequest after request sense */
        USB_STOR_PRINTF("No auto request and good\n");
        return USB_STOR_TRANSPORT_GOOD;
    }
    /* issue an request_sense */
    memset(&psrb->cmd[0],0,12);
    psrb->cmd[0]=SCSI_REQ_SENSE;
    psrb->cmd[1]=srb->lun<<5;
    psrb->cmd[4]=18;
    psrb->datalen=18;
    psrb->pdata=&srb->sense_buf[0];
    psrb->cmdlen=12;
    /* issue the command */
    result=usb_stor_CB_comdat(psrb,us);
    USB_STOR_PRINTF("auto request returned %d\n",result);
    /* if this is an CBI Protocol, get IRQ */
    if(us->protocol==US_PR_CBI) 
    {
        status=usb_stor_CBI_get_status(psrb,us);
    }
    if((result<0)&&!(us->pusb_dev->status & USB_ST_STALLED)) 
    {
        USB_STOR_PRINTF(" AUTO REQUEST ERROR %d\n",us->pusb_dev->status);
        return USB_STOR_TRANSPORT_ERROR;
    }
    USB_STOR_PRINTF("autorequest returned 0x%02X 0x%02X 0x%02X 0x%02X\n",srb->sense_buf[0],srb->sense_buf[2],srb->sense_buf[12],srb->sense_buf[13]);
    /* Check the auto request result */
    if((srb->sense_buf[2]==0) &&
    (srb->sense_buf[12]==0) &&
    (srb->sense_buf[13]==0)) /* ok, no sense */
    return USB_STOR_TRANSPORT_GOOD;
    /* Check the auto request result */
    switch(srb->sense_buf[2]) 
    {
    case 0x01: 
        /* Recovered Error */
        return USB_STOR_TRANSPORT_GOOD;
        break;
    case 0x02: 
        /* Not Ready */
        if(notready++ > USB_TRANSPORT_NOT_READY_RETRY) 
        {
            USB_STOR_PRINTF("cmd 0x%02X returned 0x%02X 0x%02X 0x%02X 0x%02X (NOT READY)\n",
            srb->cmd[0],srb->sense_buf[0],srb->sense_buf[2],srb->sense_buf[12],srb->sense_buf[13]);
            return USB_STOR_TRANSPORT_FAILED;
        } 
        else 
        {
            wait_ms(100);
            goto do_retry;
        }
        break;
    default:
        if(retry++ > USB_TRANSPORT_UNKNOWN_RETRY) 
        {
            USB_STOR_PRINTF("cmd 0x%02X returned 0x%02X 0x%02X 0x%02X 0x%02X\n",
            srb->cmd[0],srb->sense_buf[0],srb->sense_buf[2],srb->sense_buf[12],srb->sense_buf[13]);
            return USB_STOR_TRANSPORT_FAILED;
        } 
        else 
        {
            goto do_retry;
        }
        break;
    }
    return USB_STOR_TRANSPORT_FAILED;
}


static int usb_inquiry(ccb *srb,struct us_data *ss)
{
    int retry,i;
    retry=5;
    do 
    {
        memset(&srb->cmd[0],0,12);
        srb->cmd[0]=SCSI_INQUIRY;
        srb->cmd[1]=srb->lun<<5;
        srb->cmd[4]=36;
        srb->datalen=36;
        srb->cmdlen=12;
        i=ss->transport(srb,ss);
        USB_STOR_PRINTF("inquiry returns %d\n",i);
        if(i==0)
        break;
    } 
    while(retry--);
    if(!retry) 
    {
        USB_STOR_PRINTF("error in inquiry\n");
        return -1;
    }
    return 0;
}


static int usb_request_sense(ccb *srb,struct us_data *ss)
{
    char *ptr;
    ptr=(char *)srb->pdata;
    memset(&srb->cmd[0],0,12);
    srb->cmd[0]=SCSI_REQ_SENSE;
    srb->cmd[1]=srb->lun<<5;
    srb->cmd[4]=18;
    srb->datalen=18;
    srb->pdata=&srb->sense_buf[0];
    srb->cmdlen=12;
    ss->transport(srb,ss);
    USB_STOR_PRINTF("Request Sense returned %02X %02X %02X\n",srb->sense_buf[2],srb->sense_buf[12],srb->sense_buf[13]);
    srb->pdata=(unsigned char *)ptr;
    return 0;
}


static int usb_test_unit_ready(ccb *srb,struct us_data *ss)
{
    int retries = 10;
    do 
    {
        memset(&srb->cmd[0],0,12);
        srb->cmd[0]=SCSI_TST_U_RDY;
        srb->cmd[1]=srb->lun<<5;
        srb->datalen=0;
        srb->cmdlen=12;
        if(ss->transport(srb,ss)==USB_STOR_TRANSPORT_GOOD) 
        {
            return 0;
        }
        usb_request_sense (srb, ss);
        wait_ms (100);
    } 
    while(retries--);
    return -1;
}


static int usb_read_capacity(ccb *srb,struct us_data *ss)
{
    int retry;
    retry = 3; /* retries */
    do 
    {
        memset(&srb->cmd[0],0,12);
        srb->cmd[0]=SCSI_RD_CAPAC;
        srb->cmd[1]=srb->lun<<5;
        srb->datalen=8;
        srb->cmdlen=12;
        if(ss->transport(srb,ss)==USB_STOR_TRANSPORT_GOOD) 
        {
            return 0;
        }
    } 
    while(retry--);
    return -1;
}


static int usb_read_10(ccb *srb,struct us_data *ss, unsigned long start, unsigned short blocks)
{
    memset(&srb->cmd[0],0,12);
    srb->cmd[0]=SCSI_READ10;
    srb->cmd[1]=srb->lun<<5;
    srb->cmd[2]=((unsigned char) (start>>24))&0xff;
    srb->cmd[3]=((unsigned char) (start>>16))&0xff;
    srb->cmd[4]=((unsigned char) (start>>8))&0xff;
    srb->cmd[5]=((unsigned char) (start))&0xff;
    srb->cmd[7]=((unsigned char) (blocks>>8))&0xff;
    srb->cmd[8]=(unsigned char) blocks & 0xff;
    srb->cmdlen=12;
    USB_STOR_PRINTF("read10: start %lx blocks %x\n",start,blocks);
    return ss->transport(srb,ss);
}


#define USB_MAX_READ_BLK 20
unsigned long usb_stor_read(int device, unsigned long blknr, unsigned long blkcnt, unsigned long *buffer)
{
    unsigned long start,blks, buf_addr;
    unsigned short smallblks;
    struct usb_device *dev;
    int retry,i;
    ccb *srb = &usb_ccb;
    if (blkcnt == 0)
    return 0;
    device &= 0xff;
    /* Setup  device
    	 */
    USB_STOR_PRINTF("\nusb_read: dev %d \n",device);
    dev=NULL;
    for(i=0;i<USB_MAX_DEVICE;i++) 
    {
        dev=usb_get_dev_index(i);
        if(dev==NULL) 
        {
            return 0;
        }
        if(dev->devnum==usb_dev_desc[device].target)
        break;
    }
    usb_disable_asynch(1); /* asynch transfer not allowed */
    srb->lun=usb_dev_desc[device].lun;
    buf_addr=(unsigned long)buffer;
    start=blknr;
    blks=blkcnt;
    if(usb_test_unit_ready(srb,(struct us_data *)dev->privptr)) 
    {
        USB_STOR_PRINTF("Device NOT ready\n   Request Sense returned %02X %02X %02X\n",
        srb->sense_buf[2],srb->sense_buf[12],srb->sense_buf[13]);
        return 0;
    }
    USB_STOR_PRINTF("\nusb_read: dev %d startblk %lx, blccnt %lx buffer %lx\n",device,start,blks, buf_addr);
    do 
    {
        retry=2;
        srb->pdata=(unsigned char *)buf_addr;
        if(blks>USB_MAX_READ_BLK) 
        {
            smallblks=USB_MAX_READ_BLK;
        } 
        else 
        {
            smallblks=(unsigned short) blks;
        }
    retry_it:
        if(smallblks==USB_MAX_READ_BLK)
        usb_show_progress();
        srb->datalen=usb_dev_desc[device].blksz * smallblks;
        srb->pdata=(unsigned char *)buf_addr;
        if(usb_read_10(srb,(struct us_data *)dev->privptr, start, smallblks)) 
        {
            USB_STOR_PRINTF("Read ERROR\n");
            usb_request_sense(srb,(struct us_data *)dev->privptr);
            if(retry--)
            goto retry_it;
            blkcnt-=blks;
            break;
        }
        start+=smallblks;
        blks-=smallblks;
        buf_addr+=srb->datalen;
    } 
    while(blks!=0);
    USB_STOR_PRINTF("usb_read: end startblk %lx, blccnt %x buffer %lx\n",start,smallblks,buf_addr);
    usb_disable_asynch(0); /* asynch transfer allowed */
    if(blkcnt>=USB_MAX_READ_BLK)
    USB_STOR_PRINTF("\n");
    return(blkcnt);
}


/* Probe to see if a new device is actually a Storage device */
int usb_storage_probe(struct usb_device *dev, unsigned int ifnum,struct us_data *ss)
{
    struct usb_interface_descriptor *iface;
    int i;
    unsigned int flags = 0;
    int protocol = 0;
    int subclass = 0;
    /* let's examine the device now */
    iface = &dev->config.if_desc[ifnum];
    if (dev->descriptor.bDeviceClass != 0 ||
    iface->bInterfaceClass != USB_CLASS_MASS_STORAGE ||
    iface->bInterfaceSubClass < US_SC_MIN ||
    iface->bInterfaceSubClass > US_SC_MAX) 
    {
        /* if it's not a mass storage, we go no further */
        return 0;
    }
    memset(ss, 0, sizeof(struct us_data));
    /* At this point, we know we've got a live one */
    USB_STOR_PRINTF("\n\nUSB Mass Storage device detected\n");
    /* Initialize the us_data structure with some useful info */
    ss->flags = flags;
    ss->ifnum = ifnum;
    ss->pusb_dev = dev;
    ss->attention_done = 0;
    /* If the device has subclass and protocol, then use that.  Otherwise,
    	 * take data from the specific interface.
    	 */
    if (subclass) 
    {
        ss->subclass = subclass;
        ss->protocol = protocol;
    } 
    else 
    {
        ss->subclass = iface->bInterfaceSubClass;
        ss->protocol = iface->bInterfaceProtocol;
    }
    /* set the handler pointers based on the protocol */
    USB_STOR_PRINTF("Transport: ");
    switch (ss->protocol) 
    {
    case US_PR_CB:
        USB_STOR_PRINTF("Control/Bulk\n");
        ss->transport = usb_stor_CB_transport;
        ss->transport_reset = usb_stor_CB_reset;
        break;
    case US_PR_CBI:
        USB_STOR_PRINTF("Control/Bulk/Interrupt\n");
        ss->transport = usb_stor_CB_transport;
        ss->transport_reset = usb_stor_CB_reset;
        break;
    case US_PR_BULK:
        USB_STOR_PRINTF("Bulk/Bulk/Bulk\n");
        ss->transport = usb_stor_BBB_transport;
        ss->transport_reset = usb_stor_BBB_reset;
        break;
    default:
        USB_STOR_PRINTF("USB Storage Transport unknown / not yet implemented\n");
        return 0;
        break;
    }
    /*
    	 * We are expecting a minimum of 2 endpoints - in and out (bulk).
    	 * An optional interrupt is OK (necessary for CBI protocol).
    	 * We will ignore any others.
    	 */
    for (i = 0; i < iface->bNumEndpoints; i++) 
    {
        /* is it an BULK endpoint? */
        if ((iface->ep_desc[i].bmAttributes &  USB_ENDPOINT_XFERTYPE_MASK)
        == USB_ENDPOINT_XFER_BULK) 
        {
            if (iface->ep_desc[i].bEndpointAddress & USB_DIR_IN)
            ss->ep_in = iface->ep_desc[i].bEndpointAddress &
            USB_ENDPOINT_NUMBER_MASK;
            else
            ss->ep_out = iface->ep_desc[i].bEndpointAddress &
            USB_ENDPOINT_NUMBER_MASK;
        }
        /* is it an interrupt endpoint? */
        if ((iface->ep_desc[i].bmAttributes & USB_ENDPOINT_XFERTYPE_MASK)
        == USB_ENDPOINT_XFER_INT) 
        {
            ss->ep_int = iface->ep_desc[i].bEndpointAddress &
            USB_ENDPOINT_NUMBER_MASK;
            ss->irqinterval = iface->ep_desc[i].bInterval;
        }
    }
    USB_STOR_PRINTF("Endpoints In %d Out %d Int %d\n",
    ss->ep_in, ss->ep_out, ss->ep_int);
    /* Do some basic sanity checks, and bail if we find a problem */
    if (usb_set_interface(dev, iface->bInterfaceNumber, 0) ||
    !ss->ep_in || !ss->ep_out ||
    (ss->protocol == US_PR_CBI && ss->ep_int == 0)) 
    {
        USB_STOR_PRINTF("Problems with device\n");
        return 0;
    }
    /* set class specific stuff */
    /* We only handle certain protocols.  Currently, these are
    	 * the only ones.
    	 * The SFF8070 accepts the requests used in u-boot
    	 */
    if (ss->subclass != US_SC_UFI && ss->subclass != US_SC_SCSI &&
    ss->subclass != US_SC_8070) 
    {
        USB_STOR_PRINTF("Sorry, protocol %d not yet supported.\n",ss->subclass);
        return 0;
    }
    if(ss->ep_int) 
    {
        /* we had found an interrupt endpoint, prepare irq pipe */
        /* set up the IRQ pipe and handler */
        ss->irqinterval = (ss->irqinterval > 0) ? ss->irqinterval : 255;
        ss->irqpipe = usb_rcvintpipe(ss->pusb_dev, ss->ep_int);
        ss->irqmaxp = usb_maxpacket(dev, ss->irqpipe);
        dev->irq_handle=usb_stor_irq;
    }
    dev->privptr=(void *)ss;
    return 1;
}


int usb_stor_get_info(struct usb_device *dev,struct us_data *ss,block_dev_desc_t *dev_desc)
{
    unsigned char perq,modi;
    unsigned long cap[2];
    unsigned long *capacity,*blksz;
    ccb *pccb = &usb_ccb;
    /* for some reasons a couple of devices would not survive this reset */
    if (
    /* Sony USM256E */
    (dev->descriptor.idVendor == 0x054c &&
    dev->descriptor.idProduct == 0x019e)
    ||
    /* USB007 Mini-USB2 Flash Drive */
    (dev->descriptor.idVendor == 0x066f &&
    dev->descriptor.idProduct == 0x2010)
    )
    USB_STOR_PRINTF("usb_stor_get_info: skipping RESET..\n");
    else
    ss->transport_reset(ss);
    pccb->pdata = usb_stor_buf;
    dev_desc->target = dev->devnum;
    pccb->lun = dev_desc->lun;
    USB_STOR_PRINTF(" address %d\n",dev_desc->target);
    if(usb_inquiry(pccb,ss))
    return -1;
    perq = usb_stor_buf[0];
    modi = usb_stor_buf[1];
    if((perq & 0x1f) == 0x1f) 
    {
        return 0; /* skip unknown devices */
    }
    if((modi&0x80) == 0x80) 
    {
        /* drive is removable */
        dev_desc->removable = 1;
    }
    memcpy(&dev_desc->vendor[0], &usb_stor_buf[8], 8);
    memcpy(&dev_desc->product[0], &usb_stor_buf[16], 16);
    memcpy(&dev_desc->revision[0], &usb_stor_buf[32], 4);
    dev_desc->vendor[8] = 0;
    dev_desc->product[16] = 0;
    dev_desc->revision[4] = 0;
    USB_STOR_PRINTF("ISO Vers %X, Response Data %X\n",usb_stor_buf[2],usb_stor_buf[3]);
    if(usb_test_unit_ready(pccb,ss)) 
    {
        USB_STOR_PRINTF("Device NOT ready\n   Request Sense returned %02X %02X %02X\n",pccb->sense_buf[2],pccb->sense_buf[12],pccb->sense_buf[13]);
        if(dev_desc->removable == 1) 
        {
            dev_desc->type = perq;
            return 1;
        }
        else
        return 0;
    }
    pccb->pdata = (unsigned char *)&cap[0];
    memset(pccb->pdata,0,8);
    if(usb_read_capacity(pccb,ss) != 0) 
    {
        USB_STOR_PRINTF("READ_CAP ERROR\n");
        cap[0] = 2880;
        cap[1] = 0x200;
    }
    USB_STOR_PRINTF("Read Capacity returns: 0x%lx, 0x%lx\n",cap[0],cap[1]);
    cap[0] = ((unsigned long)(
    (((unsigned long)(cap[0]) & (unsigned long)0x000000ffUL) << 24) |
    (((unsigned long)(cap[0]) & (unsigned long)0x0000ff00UL) <<  8) |
    (((unsigned long)(cap[0]) & (unsigned long)0x00ff0000UL) >>  8) |
    (((unsigned long)(cap[0]) & (unsigned long)0xff000000UL) >> 24) ));
    cap[1] = ((unsigned long)(
    (((unsigned long)(cap[1]) & (unsigned long)0x000000ffUL) << 24) |
    (((unsigned long)(cap[1]) & (unsigned long)0x0000ff00UL) <<  8) |
    (((unsigned long)(cap[1]) & (unsigned long)0x00ff0000UL) >>  8) |
    (((unsigned long)(cap[1]) & (unsigned long)0xff000000UL) >> 24) ));
    /* this assumes bigendian! */
    cap[0] += 1;
    capacity = &cap[0];
    blksz = &cap[1];
    USB_STOR_PRINTF("Capacity = 0x%lx, blocksz = 0x%lx\n",*capacity,*blksz);
    dev_desc->lba = *capacity;
    dev_desc->blksz = *blksz;
    dev_desc->type = perq;
    USB_STOR_PRINTF(" address %d\n",dev_desc->target);
    USB_STOR_PRINTF("partype: %d\n",dev_desc->part_type);
    init_part(dev_desc);
    USB_STOR_PRINTF("partype: %d\n",dev_desc->part_type);
    return 1;
}


